remove lowest level componets from library browser

[Ibidu]

For simplified model some 'atomic' components (such as CCS_to_Sensor0 transform) show up in the simulink library browser.
And are not useful by themselves.

[Ibidu]

the issue seems to be that matlab thinks that the subsystems containing these parts are their own libraries instead of just a single subsystem.

E.g. the open chain for the full simulation